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Ozone layer is a concentration of ozone molecules up in the Stratosphere (10 to 50 kms)

Ozone is produced only at the ground level and flows to high altitude to form Ozone layer

In Stratosphere Ultraviolet rays break down oxygen molecules into atomic oxygen(O) which then combines with Oxygen molecule(O2) to form Ozone (O3)

Around 90% of the Ozone in our atmosphere is contained in Troposphere only (within 10 kms)

By the number of ozone atoms in an atmospheric column, called Chapman unit

By expressing the columnar density of Ozone in Dobson unit (thickness of ozone in an atmospheric column under standard temperature and pressure)

By measuring the ultraviolet radiation level in the ground

By measuring the Oxygen level in the Stratosphere

Human activities of using CFC, HCFC within air-conditioners or refrigerators

Man-made climate change leading to unusual reduction in stratospheric temperature (while temperature nearer earth increases)

Dumping of old refrigerators in the ground

Volcanic eruptions leading to injection of hydrogen chloride (HCl) into the atmosphere

Human health is severely impacted with impacts such as Skin Cancer, cataracts and damage to immune systems

Phytoplankton production is reduced leading to severe impact on marine ecosystems

Ozone depletion directly leads to natural calamities such as storms, floods etc

By severely damaging plants and other sinks of greenhouse gases, ozone depletion leads to climate change